Variable Types and Containers

Sections

Variable Types

Type Size
(bytes) Description Range

Type	Size (bytes)	Description	Range
`int`	4	Used when the data are all integers Ex: 1, 2, -8, 0, -350	-2 147 483 648 to 2 147 483 847
`unsigned int`	4	Used when the data are all positive integers and zero.	0 to 4 294 967 295
`float`	4	Includes all real numbers. Ex: 1.0, 3.14, 1.2345
`char`	1	Characters part of ASCII. Each character is stored as a numerical representation. Ex: ‘a’,’b’,’@’	Irrelevant if only used for ASCII
`boolean`	1	Stores either true (1) or false (0)
`long long`	8	Used when the data are very large integers that go beyond the range of an integer type	-9 quintillion to 9 quintillion
`unsigned long long`	8	Used when the data are all very large integers that never go below 0	0 to 18 quintillion
`short`	2	Smaller range of integers, uses less memory	-32 768 to 32 767
`unsigned short`	2	Used when the data are all small positive integers and zero	0 to 65 535
`double`	8	Used when more memory is needed for a float

int

Used when the data are all integers
Ex: 1, 2, -8, 0, -350

-2 147 483 648 to
2 147 483 847

unsigned int

Used when the data are all positive integers and zero.

0 to
4 294 967 295

float

Includes all real numbers.
Ex: 1.0, 3.14, 1.2345

char

Characters part of ASCII. Each character is stored as a numerical representation.

Ex: ‘a’,’b’,’@’

Irrelevant if only used for ASCII

boolean

Stores either true (1) or false (0)

long long

Used when the data are very large integers that go beyond the range of an integer type

-9 quintillion to
9 quintillion

unsigned long long

Used when the data are all very large integers that never go below 0

0 to 18 quintillion

short

Smaller range of integers, uses less memory

-32 768 to
32 767

unsigned short

Used when the data are all small positive integers and zero

0 to 65 535

double

Used when more memory is needed for a float

Name Library Description

Arrays

Vector

<vector>

Stack

<stack>

Queue

<queue>

Pair

<utility>

Map

<map>